Shrader, Robert L. <br/><br/>
Electronic communication / 

 - 6th ed. 
 - Lake forest:   Macmillan,   1993. 
 - xiii, 713 p. 
<br/><br/><label>ISBN: </label>0070571570 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telecommunication
<br/><br/><label>Dewey Class. No.: </label>621.38  / S5611